That is indeed odd. It's like PGC suddenly made a copy of OP in their system, and as the system is crawling around updating his caches, they are transfered to the "new" account.
Only reason for that I can think of is if OP name changed recently, and then changed the name back again, and therefor confusing PGC. It's very farstretched and highly unlikely.
Maybe someone behind the curtains here at PGC can take a look, it's probably the only chance to find out what's going on at this point. :)